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Poste.io vs Mailu: catalog facts
Poste.io	Mailu
Freemium Free for personal use with paid licensing for larger deployments.	Free Free and open source.
Linux, Self-hosted	Linux, Self-hosted
Single Docker container simplifies deployment of a full mail stack Includes web admin, webmail, and TLS handling out of the box	Webmail and admin interface included Per-domain delegation and quotas
Free tier is limited, with paid licensing for larger deployments Requires Docker knowledge and a server to run	Requires Docker Releases are infrequent
Self-hosted	Self-hosted
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.